Optimized effective permittivity to improve imaging resolution of multilayered structures in the infrared
2009 (English)In: J OPT SOC AM A-OPT IMAGE SCI, ISSN 1084-7529, Vol. 26, no 2, 365-370 p.Article in journal (Refereed) Published
Two periodic structures with different effective impedances, both comprising alternate layers of a positive and a negative permittivity material, are considered in the infrared. We find that the Fabry-Perot resonance effect periodically influences the sharpness of subwavelength focusing as the total thicknesses of the two structures increase, especially for the impedance-matched structure. On the basis of the improved multilayered structures, we design an optimized structure (i.e., the effective impedance is chosen between 0 and 1) for which a higher resolution less than lambda/12 (lambda is the wavelength in the air) can be obtained through weighing the advantages and disadvantages of the two different multilayered structures and choosing appropriate surface terminations.
Place, publisher, year, edition, pages
2009. Vol. 26, no 2, 365-370 p.
IdentifiersURN: urn:nbn:se:kth:diva-12463ISI: 000264036500020ScopusID: 2-s2.0-60949112109OAI: oai:DiVA.org:kth-12463DiVA: diva2:312934